Method of blasting earth



(No Model.)

EL H. BOURNE.

h METHOD OF BLASTING EARTH. No. 351,959. Patented Nov. 2, 1886.

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UNITED STATES PATENT OFFICE.

HENRY H. BOURNE, OF MANHATTAN, KANSAS.

METHOD OF BLASTING EARTH.

SPECIFICATION forming part of Letters Patent No. 351,959, dated November2, 1886.

Application filed July 16. 1886. Serial No. 208,199.

To all whom, it may concern.-

Be it known that I, H NRY H. BOURNE, of Manhattan, in the county ofRiley and the State of Kansas, have invented a new and Improved Methodfor Blasting Earth, of which the following is a full, clear, and exactde scription.

My invention relates to a novel method of blasting earth, applicable foruse in the blast ing or excavating of almost any form of earth where itis necessary to move large bodies of material.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views.

Figure 1 is a vertical sectional View of a bank representing the same asit appears after the first step of my improved method of blasting earthhas been taken. Fig. 2 is a similar view representing the same after thesecond step of the method has been taken, and Fig. 3 is a Viewrepresenting the bank as it appears when ready forthe final operation ofblasting.

In carrying out my invention,l bore ordrill a hole, 2, in a bank at aproper distance from the edge, and this hole I line with a tube or curb,3, which extends to a point closely approaching the bottom of thehole. Ithen lower a dynamite cartridge, 4, to the bottom of the hole 2, saidcartridge being connected to a proper fuse, 5. After the cartridge ethasbeen (No model.)

lowered, as described, it is exploded, so as to form such a cavity asthe one illustrated at 6 in Fig. 2. The cavity 6 having been formed isfilled with gunpowder or any other proper kind of explosive, afuse,7,being lowered, so as to extend within the body of the gunpowder 8,

the fuse being carried to the point required by a weight, 9. After thechamber6 has been filled with a proper explosive, the tube 3 iswithdrawn and the hole 2 is entirely or partially filled with tamping.The fuse7 is then ignited and the powder 8 is exploded.

In practice the holes 2 are often sunk to a depth of from twenty-five tothirty-five, or even forty, feet, and it will be found that the work ofthe explosive contained within the chamber 6 will be very thorough andefficient.

Having thus fully described my invention, I claim as newand desire tosecure by Letters Patent- The herein described method of blasting earth,which consists in boring ahole of proper depth, inserting a tube withinsaid hole, exploding a cartridge beneath the lower end of thetube,filling the chamber caused by the explosion of the cartridge with'aproper explosive,withdrawing the tube, and exploding the explosive,substantially as described.

HENRY H. BOURNE.

Witnesses:

PHILIP G. HELDER, JAMES T. RITCHIE.

